Dock-crane



,F. L. SABIN. DOCK CRANE. APPLICATION FILED OCT-24.17919.

Patented May 24, 1921-.

3 SHEETS-SHEET l.

F. L. SABIN.

DOCK CRANE.

APPLICATION FILED 02124, 19w.

1,378,98 1, Patented May 24, 1921.

3 SHEETSSHEET 3.

.3212. v eial agf the appended claims.

UNITED srArlzs PATENT coFFicE.

FORD L. sAnIN, OlbLEvELAND HEIGHTS,- OHIO, ASSIGNOR 'ro rim WELLMAN-SEAVER-MOBGALN OHIO.

To all whomit may concern: a V o Be it known that I, Fonn L. SABIN, acitizen of the United States, residing at Cleveland Heights, in thecounty of Cuyahoga and State of Ohio, have inventedfa certain new anduseful Improvement 'in Dock- Cranes, of which the following is a full,clear, and exact description. 7

This invention relates to an improved dock crane of a type which isdesigned tobe run along or to be positioned at any point on a dock, andhaving a boom whose outer end isintended to project over a boat to beloaded or unloaded, and whose inner end is adapted to project into adock shed so that by means of a trolley movable along the boom,merchandise may be transferred from the vessel to the shed, or viceversa. v

The-principal object of the invention-is to provide a construction bywhich the outer part ofthe boom can be elevated and swung clear of theboat rigging, and the inner end of the boom may at the same time bemoved outward-1y so as to clear the uprights of the shed, thus allowingthe crane as a whole to be moved along, the dock.

In the embodiment of my invention herein illustrated a boom composed oftwo hinge' d -parts is utilized, and provision is made for moving theinner portion of the boom inan .endwise direction along a suitabletracliwa y of, the crane structure while the-outer part' of the boom isadapted to be swung; vertically. filhe construction is such that when itis desired to move the crane along the dock; the inner section of theboom is moved outwardly so as to clear the shed and at the same time.through the power which impartsendwise movement to theinner section, theouter section is swung upwardlyi w a a f o The invention maybe'furtherbriefly summarized as consisting in certain novel: de-

tails ofconstru'ction: and combinations and arrangements of partsjwhich'will be described in the specification and set forth in In theaccompanyin 1 sheet of drawin s, wherein I have-shown't e preferredembodiment of the invention, Figure" l is a side view of a"craneembodying my invention with thedock and other parts with which COMPANY;or CLEVELAND, onro, AcoRPoRATIoN or DOCK-CRANE.

Specificationof Letters Patent. Patented fllay 24, 1921 Applicationfiled October 24, 1919, Serial No. 332,967.

the crane is'utilized being shown in section or endeleva'tion. Fig. 2'is an enlarged longitudinal sectional view taken through'the boom whenthe latter isin a position permitting the crane to be moved along thedock Fig. 8 is a transverse sectional view through a portion of thecrane structure showing also delivered from a boat 12. Adapted to travelalong the dock at the front of the shed 1-1 is a crane structure 13which in-this instance runs along the lower rail 14 and an upper rail 15carried by the dock shed. Merchandise is adapted to be transferred fromthe boat to the shed, or from the shed to the boat by a trolley,indicated at 16 adapted to travel along aboom 17 which when in positionfor transferringthe merchandise is preferably inclined substantially asshown-in Fig. 1', andhas'its outer end extending over the boat and itsinner end extendinginto dock shed. It: will be .seen therefore thattopermit the crane to be transferred along the dock, the outer .end' ofthe boom must be raised so as w th i the boat rigging and the inner endof the boom must be moved outwardly so' as to clearthe uprights at thefrontoflthe dbck shed". It is important also that when the boom isshifted to permit the crane'to Jbe moved ,-the-inner end of the boom begiven such a movement that will not s'trikefor interfere with cars.such" as shown at 1 8,

shedand the edge of thedock To accomplish this result it has heretoforewhich may be on tracks between the dock been proposed to? pivot; theboom, on the cranestru'cture for movement about atransverse axis thepIVOt point being at some point between the ends of the boom, and it hasbeen' proposed alsoto first shift the entire boom in an endwi'sedirection in the crane structure, and thento swing it about atransverseaxis. c

The arrangement or structure contemtion 17 Additionally, I provide inthe crane structure trackways 20, 20, along which the inner section 17of the boom is adaptedto travel in an endwise direction. In thisinstance the trackways are formed by pairs of oppositely disposed rails20?,

20, which rails are positioned in the crane structure a suitabledistance apart on the opposite sides of the longitudinal axis of theboom. i

In this case the two trackways on opposite sides of the boom axis arespaced a distance apart. which is considerably wider than the boomproper, and the inner section 17 of the boom is provided with alaterally extending portion 21 at the sides of which are track wheels 22which engage the rails forming the trackways. Prefe ably the trackw-aysare inclined as shown on Figs. 1 and 2, so that when the boom is inoperative position with the forward section 17 in alinement with therear section 17, the boom will be inclined as previously stated. Thisfacilitates the transporting of merchandise from the boat to the dock,since the trolley can be run down the boom by gravity. A furtheradvantage of the inclined normal position of the boom lies in the factthat the boom can be restored to its normal position by gravity.

In order that the axial movement of the rear section and the swingingmovement of the forward section. of the boom may take placesimultaneously, through power ap plied at one point, the forward sectionof the boom is connected to the top of the crane structure by a more orless rigid arm or rod 23. This rod is pivoted at one end to the boomsection at 23*, and is pivoted to the top ofthe frame structure at 23 Byreason of this construction the outward endwise movement of the rearboom sectionis accompanied by an upwardswinging. of the outer boomsection, and the inward endwise movement of the inner boom section isaccompanied by the downward swinging movement of the outerboom section,until both boom sections are in direct alinement.

The boom can be shifted in the manner just stated in different ways,.but in this instance by a cable 24; adapted to be wound onto andunwoundfrom a drum 25 located in the operators station 26 on the cranestructure. In this instance both ends of the cable pass about the drumand from the drum, both portions of the cablepass forwardly about a pairof sheaves 27, which are supported on the crane structure (see Fig. 4).Then both portions of the cable pass rearwardly to and around a pair ofsheaves 28 carried by the boom, then they pass forwardly around aipairofsheaves 29 arranged coaxially with respect to the sheaves 27 then againrearwardly and around a horizontal sheave 30, likewise carried by theboom structure. With this arrangementby winding in on the cable theinner or rear section of the boom is pulled outwardly along thetrackways, this movement being accompanied by the upward swingingmovement of the outer boom section. And when the cable is paid out theboom section 17 runs down the trackways to its normal position, where astop is encountered which limits its inward movement, this inwardmovement of the boom section 17 being accompanied by the downward:swinging ofthe outer boom section.

It might be mentioned thatin Fig. 1 the boom is in its normal position,and that in Figs. 2 and 4 the boom orso much of it as is shown in thesefigures is in its abnormal position which permits the crane as a wholeto be transported along the dock. It will be noted also by reference toFig.2 that. when the boom has been given its full movement from normalto abnormal position the forward end of the inner boom section 17 is atthe front ofthe crane structure 13, the for- U ward part of wheels 22which travel along the trackways of the boom structure then being at theextreme forward ends of the trackways. Likewise when the boom is in theposition stated the forward section 17 is U ing immaterial to myinvention. It will be suflicient to state that the trolley fore referredto will have suitable track wheels 16 designed to travel along two rails31 of the boom, as shown in Fig. 3, which 16 heretorails are of coursecarried part'by the endwise movable section 17 and part by the swingingboom section 17", the joint occurring in the trolley rails at thejointor pivot point ofthe two boom sections. It is important that whenthe two boom sections ar e in alinement ready for use, the portionsofthe trolley rails carriedby the 'tw'o boom sections'be in alinement orsufliciently close alinement that the trolley can readily pass over therail joints. The trolley, is moved along the boom and trolley hook orload carrying device is raised and lowered by cables 32 and. 33 whichpass about. suitable drums 34.- and 35in the operators shed 26, thesedrums, as well as the boom shifting drum being all motor operated in anysuitable manner. 1"

I do not desire to be confined to the exact detail shown but aim in myclaims to cover all modifications which do not involve a departure fromthe spirit and scope of my invention in its broadest aspects.

Having described my invention, I claim- 1. A dock crane comprising acrane structure having a boom for a trolley, the boom being composed ofrelatively movable sections along both of which the trolley is adaptedto travel, one section mounted for endwise movement in the cranestructure.

2. A dock crane comprising a crane structure having a boom fora trolley,the boom being composed of hinged or pivoted sections along both ofwhich the trolley is adapted to travel, one section mounted for endwisemovement in the crane structure.

3. A dock crane comprising a crane structure having a boom for atrolley, the boom being composed of an inner section mounted for endwisemovement in the crane structure, and an outer section hinged to theinner section to swing vertically, said trolley adapted to travel alongboth sections.

4. A dock crane comprising a crane structure having a boom for atrolley, the crane structure having a trackway and the boom beingcomposed of sections, one adapted to be shifted in an endwise directionalong said trackway, and the other to be swung vertically relative tothe crane structure, said trolley adapted to travel along both sections.

5. A dock crane comprising a crane structure having a boom for atrolley, the boom being composed of an endwise movable inner rection,and means for simultaneously causing the outer section to be swung onits pivot.

7. A dock crane comprising a crane structure having a boom for atrolley, said boom being composed of an endwise movable inner portionand a vertically swinging outer portion pivoted to the end of the innerportion, power means connected to the inner portion for moving itendwise, and means connecting the outer portion to the crane structureso that the said outer portion is swung verti cally when the innersection is moved in an endwise direction by said power means.

In testimony whereof I hereunto aflix my signature.

FORD L. SABIN.

